Employee Retirement Plan - Additional Information (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Vesting period, in years	3 years
Discretionary plan contribution	$ 200,000	$ 300,000	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution per employee	1.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution per employee	20.00%
Years One Through Three [Member]
Defined Benefit Plan Disclosure [Line Items]
Annual vesting percentage	33.00%
Years Four and Thereafter [Member]
Defined Benefit Plan Disclosure [Line Items]
Annual vesting percentage	100.00%